Heat closed contact grill or panini maker for 5 minutes.
Place artichoke hearts on paper towels; pat dry. Coarsely chop artichoke hearts.
In small bowl, mix artichoke hearts, spreadable cheese and spinach. Spread mixture on 2 bread slices. Top with bell peppers, turkey and shredded cheese. Top with remaining bread slices. Spray both sides of sandwiches with cooking spray.
When grill is heated*, place sandwiches on grill. Close grill; cook 3 to 5 minutes or until bread is toasted and cheese is melted.